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  <div class="section" id="vta">
<h1>vta<a class="headerlink" href="#vta" title="永久链接至标题">¶</a></h1>
<p>This document contains the python API to VTA compiler toolchain.</p>
<span class="target" id="module-vta"></span><p>VTA Package is a TVM backend extension to support VTA hardware.</p>
<p>Besides the compiler toolchain, it also includes utility functions to
configure the hardware environment and access remote device through RPC.</p>
<div class="section" id="hardware-information">
<h2>Hardware Information<a class="headerlink" href="#hardware-information" title="永久链接至标题">¶</a></h2>
<dl class="py function">
<dt class="sig sig-object py" id="vta.Environment">
<span class="sig-prename descclassname"><span class="pre">vta.</span></span><span class="sig-name descname"><span class="pre">Environment</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">cfg</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#vta.Environment" title="永久链接至目标">¶</a></dt>
<dd><p>Hardware configuration object.</p>
<p>This object contains all the information
needed for compiling to a specific VTA backend.</p>
<dl class="field-list simple">
<dt class="field-odd">参数</dt>
<dd class="field-odd"><p><strong>cfg</strong> (<em>dict of str to value.</em>) – The configuration parameters.</p>
</dd>
</dl>
<p class="rubric">示例</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># the following code reconfigures the environment</span>
<span class="c1"># temporarily to attributes specified in new_cfg.json</span>
<span class="n">new_cfg</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="nb">open</span><span class="p">(</span><span class="s2">&quot;new_cfg.json&quot;</span><span class="p">)))</span>
<span class="k">with</span> <span class="n">vta</span><span class="o">.</span><span class="n">Environment</span><span class="p">(</span><span class="n">new_cfg</span><span class="p">):</span>
    <span class="c1"># env works on the new environment</span>
    <span class="n">env</span> <span class="o">=</span> <span class="n">vta</span><span class="o">.</span><span class="n">get_env</span><span class="p">()</span>
</pre></div>
</div>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="vta.get_env">
<span class="sig-prename descclassname"><span class="pre">vta.</span></span><span class="sig-name descname"><span class="pre">get_env</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#vta.get_env" title="永久链接至目标">¶</a></dt>
<dd><p>Get the current VTA Environment.</p>
<dl class="field-list simple">
<dt class="field-odd">返回</dt>
<dd class="field-odd"><p><strong>env</strong> – The current environment.</p>
</dd>
<dt class="field-even">返回类型</dt>
<dd class="field-even"><p>Environment</p>
</dd>
</dl>
</dd></dl>

</div>
<div class="section" id="rpc-utilities">
<h2>RPC Utilities<a class="headerlink" href="#rpc-utilities" title="永久链接至标题">¶</a></h2>
<dl class="py function">
<dt class="sig sig-object py" id="vta.reconfig_runtime">
<span class="sig-prename descclassname"><span class="pre">vta.</span></span><span class="sig-name descname"><span class="pre">reconfig_runtime</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">remote</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#vta.reconfig_runtime" title="永久链接至目标">¶</a></dt>
<dd><p>Reconfigure remote runtime based on current hardware spec.</p>
<dl class="field-list simple">
<dt class="field-odd">参数</dt>
<dd class="field-odd"><p><strong>remote</strong> (<a class="reference internal" href="../rpc.html#tvm.rpc.RPCSession" title="tvm.rpc.RPCSession"><em>RPCSession</em></a>) – The TVM RPC session</p>
</dd>
</dl>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="vta.program_fpga">
<span class="sig-prename descclassname"><span class="pre">vta.</span></span><span class="sig-name descname"><span class="pre">program_fpga</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">remote</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">bitstream</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#vta.program_fpga" title="永久链接至目标">¶</a></dt>
<dd><p>Upload and program bistream</p>
<dl class="field-list simple">
<dt class="field-odd">参数</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>remote</strong> (<a class="reference internal" href="../rpc.html#tvm.rpc.RPCSession" title="tvm.rpc.RPCSession"><em>RPCSession</em></a>) – The TVM RPC session</p></li>
<li><p><strong>bitstream</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(在 Python v3.10)"><em>str</em></a><em>, </em><em>optional</em>) – Path to a local bistream file. If unset, tries to download from cache server.</p></li>
</ul>
</dd>
</dl>
</dd></dl>

</div>
<div class="section" id="compiler-api">
<h2>Compiler API<a class="headerlink" href="#compiler-api" title="永久链接至标题">¶</a></h2>
<p>We program VTA using TVM, so the compiler API in vta package
is only a thin wrapper to provide VTA specific extensions.</p>
<dl class="py function">
<dt class="sig sig-object py" id="vta.build_config">
<span class="sig-prename descclassname"><span class="pre">vta.</span></span><span class="sig-name descname"><span class="pre">build_config</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">debug_flag</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#vta.build_config" title="永久链接至目标">¶</a></dt>
<dd><p>Build a build config for VTA.</p>
<dl class="field-list simple">
<dt class="field-odd">参数</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>debug_flag</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(在 Python v3.10)"><em>int</em></a>) – The dbeug flag to be passed.</p></li>
<li><p><strong>kwargs</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#dict" title="(在 Python v3.10)"><em>dict</em></a>) – Additional configurations.</p></li>
</ul>
</dd>
<dt class="field-even">返回</dt>
<dd class="field-even"><p><strong>build_config</strong> – The build config that can be used in TVM.</p>
</dd>
<dt class="field-odd">返回类型</dt>
<dd class="field-odd"><p><a class="reference internal" href="../ir.html#tvm.transform.PassContext" title="tvm.transform.PassContext">tvm.transform.PassContext</a></p>
</dd>
</dl>
<p class="rubric">示例</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># build a vta module.</span>
<span class="k">with</span> <span class="n">vta</span><span class="o">.</span><span class="n">build_config</span><span class="p">():</span>
    <span class="n">vta_module</span> <span class="o">=</span> <span class="n">tvm</span><span class="o">.</span><span class="n">build</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="o">...</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="vta.build">
<span class="sig-prename descclassname"><span class="pre">vta.</span></span><span class="sig-name descname"><span class="pre">build</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="o"><span class="pre">*</span></span><span class="n"><span class="pre">args</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#vta.build" title="永久链接至目标">¶</a></dt>
<dd><p>Thin wrapper of tvm.build</p>
<p>This wrapper automatically applies VTA’s build_config
if there is no user specified build_config in context.</p>
<div class="admonition seealso">
<p class="admonition-title">参见</p>
<dl class="simple">
<dt><a class="reference internal" href="../driver.html#tvm.build" title="tvm.build"><code class="xref py py-obj docutils literal notranslate"><span class="pre">tvm.build</span></code></a></dt><dd><p>The original TVM’s build function</p>
</dd>
</dl>
</div>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="vta.lower">
<span class="sig-prename descclassname"><span class="pre">vta.</span></span><span class="sig-name descname"><span class="pre">lower</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="o"><span class="pre">*</span></span><span class="n"><span class="pre">args</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#vta.lower" title="永久链接至目标">¶</a></dt>
<dd><p>Thin wrapper of tvm.lower</p>
<p>This wrapper automatically applies VTA’s build_config
if there is no user specified build_config in context.</p>
<div class="admonition seealso">
<p class="admonition-title">参见</p>
<dl class="simple">
<dt><a class="reference internal" href="../driver.html#tvm.lower" title="tvm.lower"><code class="xref py py-obj docutils literal notranslate"><span class="pre">tvm.lower</span></code></a></dt><dd><p>The original TVM’s lower function</p>
</dd>
</dl>
</div>
</dd></dl>

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